Spawn a MessageNodeDialog

Parameters

headerText	The text that appears at the top of the dialog
nodeText	The text that appears in the scroll box view of the dialog (the message for the player)
instructorPrefabName	The Instructor prefab name to show in the left side of the dialog
continueBtnText	The text to appear on the button at the bottom of the dialog
continueCallback	A callback when the button on the dialog is pressed
msgArea	The area the dialog is to be displayed on screen
autoClose	Set to true to automatically close the dialog after the autoclose time period
autoCloseTimeout	The time in seconds before automatically closing the dialog, if autoClose is true
autoGrowDialogHeight	If set to true will set the dialog height to the preferred size for the nodeText, but won't exceed the screen height.
instructorName	The name of the Instructor - If blank will use the name set in the prefab that is passed in. If set to not empty/null will override the name set in the prefab.

Returns

The Spawned MessageNodeDialog object

If true dialog is modal.